Responses
Its more he only love him at his best, and got bored when he changed. Even in the old world, it seems he loved an idealized version of him since they seemingly never really interacted much. Since he felt the same even in the old world, I'm guessing what he feels is real and he's not just using him as a tool to stroke his ego. But I doubt it's love either, more like infatuation or obsession with the version of him that he formed in his head.

I'm so glad that this time, the artist didn't cut a lot of Wonwoo and Gye Yoon's interaction, hoping it would stay like that since it's important for their development later on. But anyway, Seungwook (up to vol 4) is not a villain but he's an asshole imo. He knew the people of the Center were spreading rumors about Wonwoo stalking him but he turned a blind eye to it. He left the Wonwoo from that world because he didn't get much reaction from him, yet got mad when he wasn't the reason why Wonwoo changed. I feel like he was treating him more like a tool to stroke his ego rather than loving him genuinely